Possible use of JMS in Networking

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Possible use of JMS in Networking

• Problem with Traditional Networking
• Suns Promise
• What is JMS capable of?

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Problem with Traditional Networking Model-
Client-Server

• Although it is the most widely used networking
  architecture, however, it has some inherited
  problems
• When everything runs okay, the model works very
  well. However, when some problems occur between
  the client and server such as losing connection.

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Suns Promise

• JMS plays an important role of in distributed
  system and clustering computing because it
  provides a complete mechanism for network
  components to communicate with one another.
• Sun Microsystems promise to JMS technology
• "JMS is a strategic technology for J2EE. JMS will
  work in concert with other technologies to
  provide reliable, asynchronous communication
  between components in a distributed computing
  environment.So, whats good about it?

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What is JMS is capable of?

• Issues
• Failoverdefinition one server down, the other
  takes in its placefor example, all server
  publish message onto a JMS topic and the
  loadManageBean subscriber /receive the message to
  determine who is active and who is not active.
  And then do some redirection accordingly.
• Load-Balancing definition the mechanism which
  allows work loads can be distributed evenly
  within a cluster.Note that without good
  implementation of JMS load balancing logic and
  mechanism, it will not make any improve to add
  more servers into your cluster.

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What JMS cannot help you..

• Some basic examples that you do not expect JMS to
  do..
• -Systematic FailureexampleOne server down
  because its memory ran out. If all its work
  loads transferred to another server, it will
  cause another server down eventually.
• - Byzantine FailureIf the whole clustering
  failure is caused by one node/some nodes start
  sending corrupt data or error process. Then JMS
  cant do anything about it.
• -Effectively improve the process speed if.it is
  relative, if you do not have very big volume of
  hits by clients, the load distribution would
  only slow overall process down because of the
  overhead of extra communication and I/O among
  components.

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FYI

• It is good to know thatsome application servers
  such as BEA weblogic takes care of the failover
  and load balancing for you. You can chose either
  use round-Robin or randomly distribution for
  your load balancing scheme. The default of BEA
  weblogic is using load-balancing scheme
  First-come-first-serve.

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Some related important terms in J2EE world

• Cluster
• Clustering is the use of multiple physical
  computers to provide a single logical service the
  more capacity and reliability.
• High Abvailability (HA) The def. I have here
  is too big. Please search an easier one.
• Scalability
• Scalability is the degree to which some aspect of
  the messaging service is enhanced by adding more
  resources.
• Scalability improvement () / increase in
  number of machines ()
• MOM messageoriented middleware